Nightmare JJ is a hoax for Five Nights at Freddy's 4 meant to be an Easter egg as well as a rare replacement for Nightmare BB. She was made in 2015 by gomotion100, now known as gomotion on YouTube. She looks and acts exactly like her counterpart, in a challenge called "Fun With JJ". Nightmare JJ was likely created simply by changing the colors of Nightmare BB.
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Nightmare JJ in game edit.